Gap
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Joined: Feb 2006
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The wider the gap, the hotter the spark, but also more load on the system, but it won't matter as long as it is in the recommended range. When setting the gap, always use a wire guage, nothing flat such as a feeler gauge. 
jd
jd
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Joined: Feb 2003
Posts: 6,940
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From: Eastern WA
By setting to the mid/lower range of the gap, you will be within the recommended range of spec for a longer period than if you max it up front. Plug gap outside of the recommended range can cause, among other things, undesireable driveability issues.
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
As the spark gap is always increasing from wear, I choose to adjust the gap to the minimum side of spec, so it'll be in tolerance longer as Bill pointed out.
A gap on the narrow side of spec, will also help on really cold winter starts too.
Wider gaps begin to mess with engine timing & the spark can be blown out on really wide out of spec gaps, so the driveability thing Bill was referring to might come into play during stressful operating conditions.
Wider also works the system harder as Jim pointed out, so stay within spec & use a WIRE gauge as Jim suggested, to get the best accuracy on your gap.
Bend, don't bang the ground electrode, to adjust it's gap!!!!
A gap on the narrow side of spec, will also help on really cold winter starts too.
Wider gaps begin to mess with engine timing & the spark can be blown out on really wide out of spec gaps, so the driveability thing Bill was referring to might come into play during stressful operating conditions.
Wider also works the system harder as Jim pointed out, so stay within spec & use a WIRE gauge as Jim suggested, to get the best accuracy on your gap.
Bend, don't bang the ground electrode, to adjust it's gap!!!!
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